Effect of moisture depletion and transpiration inhibitors on potato yield grown under drip irrigation system

Abstract

The study was carried out during the 2021-2022 growing season in a field of College of Agriculture /Wasit University, for the purpose of studying irrigation scheduling and water consumption for potato plants based on moisture depletion rates and the addition of transpiration inhibitors to the cultivated plant. The experiment was carried out within the design of a factorial experiment with a split or regular RCBD arrangement. The moisture depletion with three levels (moisture depletion level of 30% of the available water A1, and a moisture depletion level of 40% of the available water A2, and a moisture depletion level of 50% of the available water A3) Allocated to the main plot.   The second factor was transpiration inhibitors are in three levels: (Armoruax inhibitor, symbolized by B1, and licorice inhibitor, symbolized by B2 without adding B0) allocated to the sub-plots. Where these inhibitors were added by spraying on the leaves and Armoruax inhibitor (B1) was added at a concentration of 1 ml/liter for each experimental unit for the treatments of this inhibitor. As for licorice (B2), it was added at a concentration of 1 ml / liter of water for each experimental unit of the treatments for this inhibitor. The control treatment (without adding licorice or Armoruax) the experimental units were left without addition.

The surface drip irrigation system with DR type (GR) was adopted in the irrigation process. Irrigation was scheduled for the growing season in the light of the moisture depletion rates mentioned above. The comparison between the averages of the treatments was done using the least significant difference L.S.D at a level of significance of 5%. The results can be summarized as follows: The results showed an increase in the number of irrigations for the treatments that were irrigated with a moisture depletion of 30% of the available water compared to the other two levels of depletion 40% and 50% of the available water. The number of irrigations for treatments sprayed with growth inhibitors and irrigated at the three moisture depletion rates reached 29,24,18, respectively. While the number of irrigations for the control treatment and irrigated treatment at the three depletion rates decreased to 24, 19, and 16 irrigations, respectively.